A Leuchtturm notebook and the Bullet Journal method!
It was the most enjoyable daily to-do method I used, though I found it lacking in task capture for long-term tasks and scheduling (pocket notebook pages typically weren’t big enough for every hour in one column, and adding a second column felt cramped). I’ve shifted approaches from a daily to-do list to a daily hourly schedule with a table in OneNote, so I no longer handwrite a to-do list (as it’s included in the schedule). However, I still use paper sometimes for breaking big tasks into small steps, and large numbers of miscellaneous one-time tasks.
I find writing it down helps me remember the tasks or things needed, and a fountain pen is just a joy to use plus you get to take mini breaks from the digital world.
Writing with an ink the color of Crimson Glory Vine, for example, is a meditation all on its own (Pilot Iroshizuku Yama-Budo).
The vintage pens rabbit hole tends to force you toward inks that are "safe" for vintage pens (Waterman Serenity Blue, for example).
But either way, what you write with them, and what system you use is constrained only by imagination.
It's a technique for manual note-keeping that is intended to drive awareness and thought about priorities. You don't have to buy notebooks set up for the technique, all you really need is pen and paper. But stationers are standing buy with merch.